I don't think it's misleading.
it's talking about the question of what happens to people who have never heard the gospel.
It's the same situation that Paul is talking about here
Romans 2: 7. to those who by patience in well-doing seek for glory, honor, and incorruptibility, eternal life; 8. but to those who are self-seeking, and don't obey the truth, but obey unrighteousness, will be wrath and indignation, 9. oppression and anguish, on every soul of man who works evil, to the Jew first, and also to the Greek. 10. But glory, honor, and peace go to every man who works good, to the Jew first, and also to the Greek. 11. For there is no partiality with God. 12. For as many as have sinned without law will also perish without the law. As many as have sinned under the law will be judged by the law. 13. For it isn't the hearers of the law who are righteous before God, but the doers of the law will be justified 14. (for when Gentiles who don't have the law do by nature the things of the law, these, not having the law, are a law to themselves, 15. in that they show the work of the law written in their hearts, their conscience testifying with them, and their thoughts among themselves accusing or else excusing them) 16. in the day when God will judge the secrets of men, according to my Good News, by Jesus Christ.
Yes, the plan of salvation does include Muslims as it includes all humans.
They go on to write
"Nor is God far distant from those who in shadows and images seek the unknown God, for it is He who gives to all men life and breath and all things, and as Saviour wills that all men be saved. Those also can attain to salvation who through no fault of their own do not know the Gospel of Christ or His Church, yet sincerely seek God and moved by grace strive by their deeds to do His will as it is known to them through the dictates of conscience. Nor does Divine Providence deny the helps necessary for salvation to those who, without blame on their part, have not yet arrived at an explicit knowledge of God and with His grace strive to live a good life.(16)"
So I think what they're saying is that humans in all places and throughout history have always been welcome to seek God. The Muslims do you have an advantage over some cultures in that they acknowledge one universal God.
Suppose we say that Jews and Christians worship the same God. Jewish rabbis generally accepted by worldwide jewry say that God did not incarnate himself through Mary. So, is it the same God?